Ben,
Ben Stienstra wrote:
Thanks for your reply. The correlation coefficient is almost back at
the normal level. I will search some old logs to see if previous
outages also shows the same behaviour. It could be perfectly normal.
Martin, I have combined all the data i have from the previous firmware
version (v5) and the current (v6). At other outages the correlation
coefficient did come up to >95% almost as fast as the field strength
(not days). The last reboot log shows 10 minutes until 'NTP sync to PZF'.
>
DCF Outage 2014-01-25:
http://imgur.com/xinzUGL
DCF Outage 2013-06-20:
http://imgur.com/QMYEOkR
In the image below you'll find the field strength and correlation over
the past 10 months. Field strength in the summer was higher than in the
winter. The low corr. at the beginning of the graph was when the antenna
was not yet outside and aligned.
http://imgur.com/sZnfSxz
I'd also expect that the correlation comes back quickly after an outage.
Although I've been involved in the development of the first DCF77
correlation receivers many years ago the firmware of these receivers is
actually maintained by other guys, one of which is still on Easter holidays.
I've forwarded your observations to the firmware maintainers, so they
can try to find out what happened. However, this may take some days.
I'll continue monitoring and when the next outage occurs, let's see what
happens. I'll contact support instead of the time-nuts list :)
Great. Usually Meinberg support is pretty responsive.
Take care, I'm biased. ;-)
Martin
--
Martin Burnicki
Senior Software Engineer
MEINBERG Funkuhren GmbH & Co. KG
Email: martin.burni...@meinberg.de
Phone: +49 (0)5281 9309-14
Fax: +49 (0)5281 9309-30
Lange Wand 9, 31812 Bad Pyrmont, Germany
Amtsgericht Hannover 17HRA 100322
Geschäftsführer/Managing Directors: Günter Meinberg, Werner Meinberg,
Andre Hartmann, Heiko Gerstung
Web: http://www.meinberg.de
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